Nghiên cứu một số đặc tính cơ học của bê tông đầm lăn sử dụng cốt liệu lớn tái chế từ bê tông phế thải

Bài viết Nghiên cứu một số đặc tính cơ học của bê tông đầm lăn sử dụng cốt liệu lớn tái chế từ bê tông phế thải trình bày một số đặc tính cơ học của bê tông đầm lăn sử dụng cốt liệu lớn tái chế từ bê tông phế thải, ứng dụng làm lớp móng đường ô tô. | Transport and Communications Science Journal Vol 73 Issue 9 12 2022 879-889 Transport and Communications Science Journal STUDY ON MECHANICAL PROPERTIES OF ROLLER- COMPACTED CONCRETE USING RECYCLED COARSE AGGREGATE FROM CONCRETE WASTE Tran Thi Bich Thao Nguyen Tien Dung University of Transport and Communications No 3 Cau Giay Street Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 18 11 2022 Revised 11 12 2022 Accepted 13 12 2022 Published online 15 12 2022 https Corresponding author Email Tel 84983352985 Abstract. Recycled aggregate concrete is a green environmentally friendly construction material and contributes to limiting the exploitation of natural resources. Roller-compacted concrete using recycled aggregate has been successfully applied in pavement structures in some countries around the world. This work aims to investigate the mechanical properties of roller-compacted concrete using recycled coarse aggregate RCA from concrete waste. In this work influences of 30 50 75 and 100 substitution of natural coarse aggregate by RCA have been considered. The concrete mix was designed according to the principle of soil mechanics optimum moisture content and maximum dry volume . When replacing natural coarse aggregate by 75 and 100 RCA the compressive strength of concrete at 28 days of age decreased by about 25-35 while the splitting tensile strength and the modulus of elasticity decreased by about 20-25 . When using 100 RCA roller-compacted concrete still retains the mechanical criteria for application in concrete pavement foundations. The research results are the scientific basis for the use of this material in civil construction in Vietnam. Keywords roller-compacted concrete RCC recycled aggregate recycled aggregate concrete compressive strength splitting tensile strength modulus of elasticity. 2022 University of Transport and Communications 879 Tạp chí Khoa học Giao thông vận tải Tập 73 Số 9 12 2022